Originally Posted by SnipSnap

Maybe the customers need to see what it could happen if plasterboard are used and no tanking or waterproof membrane is not used.

Also if they are not prepared to pay more for allowing grouting on the next day.

Mmmm, looks yummy... In the same way an infection does... I love finding black mold, it really makes my day...

There was a great article in professional builder a few months ago which states

"BS5385-1:1995 Wall and floor tiling part 1 code of practise for the design installation of internal ceramic and natural stone wall tiling and mosaics in normal conditions (Section 3.1.2.6) states that sheets such as platerboard, plywood and chipboard that are not dimensionally stable with changing humidity should not be used in wet or damp conditions.

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Section 3.2.4.3 states that plasterboard should not become damp wither during storage or after installation and BS 5385-4: 1992 Wall and floor tiling part 4: Code of practice for tiling in mosaics in specific conditions (Section 6.4) adds that water resistant materials should be used throughout and be capable of withstanding continous contact with water without deterioration.

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Ceramic tiles are 40% porous and natural stone are up to 60% porous.

One of the biggest callbacks the NHBC have is to failures in the bathroom!

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Hopefully some of this info will help

We just used normal plasterboard to get the shape of the room and marine ply for strength in some areas. Quite a mix! Oh and untreated batons 2x4's




And a BAL tanking kit on everything.




Once tiled the tanking should prevent water ingress to anything behind the unit. And to be fair mine was done in 2004 used every day.

But I guess as materials have improved they should be considered. I just did it for ease of install.

Originally Posted by SnipSnap

Maybe the customers need to see what it could happen if plasterboard are used and no tanking or waterproof membrane is not used.

Also if they are not prepared to pay more for allowing grouting on the next day.

I know it doesnt help much now you have done it but in our training with the stores we show off the waterbaths. Then ask the customer what would happen to plasterboard and plywood in these situations!